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A Circuit switched network is used to connect a location A in the UK to location B in Philadelphia using an E1 circuit with 30

A Circuit switched network is used to connect a location A in the UK to location B in Philadelphia using an E1 circuit with 30 channels. A third location C in San Diego is then connected to location B in Philadelphia using a T1 circuit with 24 channels. Keep in mind that there are NO redundant links in this network.

How many end-to-end connections can be made between location A in the UK and location C in San Diego?

A.24
B.30
C.54
D.6

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